利用pi衰减电路和超宽带放大器改进PD检测器的性能

2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS) Pub Date : 2019-10-01 DOI:10.1109/ICHVEPS47643.2019.9011122

U. Khayam, Dede Furqon Nurjaman, R. Rachmawati

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引用次数: 1

摘要

本文讨论了通过改进pi衰减电路和阻抗匹配电路的超宽带放大电路来提高局部放电检测器的性能。局部放电的发生是电力设备绝缘失效的早期征兆。这种对故障早期症状的检测方法是必不可少的。PD产生的电流在超宽带(UWB)频率高达几GHz。为了获得局部放电信号的整体频谱，局部放电测量系统的带宽应大于局部放电信号的带宽。在UWB中测量PD信号的方法之一是在PD测量系统中使用阻抗匹配电路(IMC)作为耦合器件。IMC由衰减电路和超宽带放大器组成。IMC的阻抗应与示波器同轴电缆和内部电缆的阻抗特性一致，以优化PD电流产生的功率传输。通过对pi衰减器和IMC宽带放大器的改进，提高了PD检测器的性能。采用ADS2014 (Advanced design System 2014)软件建立仿真模型进行电路设计，通过s参数仿真识别电路特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Improvement of Performance of PD Detector by Modification of Pi-Attenuator Circuit and Ultrawide Band Amplifier

This paper deals with the improvement of performance of partial discharge (PD) detector by modification of Pi-Attenuator circuit and ultra wide band amplifier of impedance matching circuit. PD occurrence is the early indicator of power apparatus insulation failure. The detection method of this early symptom toward failure is indispensable. PD cause an electrical current in the ultra wide band (UWB) frequency up to several GHz. In order to obtain overall spectrum of PD signal, the bandwidth of PD measurement system should be wider than the bandwidth of PD signal. One of the methods to measure PD signals in UWB is by using impedance matching circuit (IMC) as a coupling device in the PD measurement system. The IMC consists of attenuator circuit and UWB amplifier. The impedance of the IMC should be the same as the impedance characteristic of the coaxial and the internal cables of the oscilloscope to optimize the power transfer generated by PD current. The performance of PD detector is improved by modification of pi-attenuator and wide band amplifier of IMC. The circuit design is conducted by simulation model using Advanced Design System 2014 (ADS2014) software to identify the circuit characteristics by performing S-parameter simulation.

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来源期刊

2019 2nd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)

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